research.m1stereo.tv/gitweb/ - melted/blob - src/modules/gtk2/producer_pixbuf.c

   1 /*
   2  * producer_pixbuf.c -- raster image loader based upon gdk-pixbuf
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "producer_pixbuf.h"
  22 #include <framework/mlt_frame.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <gdk-pixbuf/gdk-pixbuf.h>
  27
  28 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
  29 static void producer_close( mlt_producer parent );
  30
  31 mlt_producer producer_pixbuf_init( const char *filename )
  32 {
  33         producer_pixbuf this = calloc( sizeof( struct producer_pixbuf_s ), 1 );
  34         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  35         {
  36                 mlt_producer producer = &this->parent;
  37
  38                 producer->get_frame = producer_get_frame;
  39                 producer->close = producer_close;
  40
  41                 this->filename = strdup( filename );
  42                 this->counter = -1;
  43                 g_type_init();
  44
  45                 return producer;
  46         }
  47         free( this );
  48         return NULL;
  49 }
  50
  51 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
  52 {
  53         // Obtain properties of frame
  54         mlt_properties properties = mlt_frame_properties( this );
  55
  56         // May need to know the size of the image to clone it
  57         int size = 0;
  58
  59         // Get the image
  60         uint8_t *image = mlt_properties_get_data( properties, "image", &size );
  61
  62         // Get width and height
  63         *width = mlt_properties_get_int( properties, "width" );
  64         *height = mlt_properties_get_int( properties, "height" );
  65
  66         // Clone if necessary
  67         if ( writable )
  68         {
  69                 // Clone our image
  70                 uint8_t *copy = malloc( size );
  71                 memcpy( copy, image, size );
  72
  73                 // We're going to pass the copy on
  74                 image = copy;
  75
  76                 // Now update properties so we free the copy after
  77                 mlt_properties_set_data( properties, "image", copy, size, free, NULL );
  78         }
  79
  80         // Pass on the image
  81         *buffer = image;
  82
  83         return 0;
  84 }
  85
  86 uint8_t *producer_get_alpha_mask( mlt_frame this )
  87 {
  88         // Obtain properties of frame
  89         mlt_properties properties = mlt_frame_properties( this );
  90
  91         // Return the alpha mask
  92         return mlt_properties_get_data( properties, "alpha", NULL );
  93 }
  94
  95 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
  96 {
  97         producer_pixbuf this = producer->child;
  98         GdkPixbuf *pixbuf = NULL;
  99         GError *error = NULL;
 100
 101         // Generate a frame
 102         *frame = mlt_frame_init( );
 103
 104         // Obtain properties of frame
 105         mlt_properties properties = mlt_frame_properties( *frame );
 106
 107     // optimization for subsequent iterations on single picture
 108         if ( this->image != NULL )
 109         {
 110                 // Set width/height
 111                 mlt_properties_set_int( properties, "width", this->width );
 112                 mlt_properties_set_int( properties, "height", this->height );
 113
 114                 // if picture sequence pass the image and alpha data without destructor
 115                 mlt_properties_set_data( properties, "image", this->image, 0, NULL, NULL );
 116                 mlt_properties_set_data( properties, "alpha", this->alpha, 0, NULL, NULL );
 117
 118                 // Set alpha mask call back
 119         ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 120
 121                 // Stack the get image callback
 122                 mlt_frame_push_get_image( *frame, producer_get_image );
 123
 124         }
 125         else if ( strchr( this->filename, '%' ) != NULL )
 126         {
 127                 // handle picture sequences
 128                 char filename[1024];
 129                 filename[1023] = 0;
 130                 int current = this->counter;
 131                 do
 132                 {
 133                         ++this->counter;
 134                         snprintf( filename, 1023, this->filename, this->counter );
 135                         pixbuf = gdk_pixbuf_new_from_file( filename, &error );
 136                         // allow discontinuity in frame numbers up to 99
 137                         error = NULL;
 138                 } while ( pixbuf == NULL && ( this->counter - current ) < 100 );
 139         }
 140         else
 141         {
 142                 pixbuf = gdk_pixbuf_new_from_file( this->filename, &error );
 143         }
 144
 145         // If we have a pixbuf
 146         if ( pixbuf )
 147         {
 148                 // Store width and height
 149                 this->width = gdk_pixbuf_get_width( pixbuf );
 150                 this->height = gdk_pixbuf_get_height( pixbuf );
 151
 152                 // Allocate/define image and alpha
 153                 uint8_t *image = malloc( this->width * this->height * 2 );
 154                 uint8_t *alpha = NULL;
 155
 156                 // Extract YUV422 and alpha
 157                 if ( gdk_pixbuf_get_has_alpha( pixbuf ) )
 158                 {
 159                         // Allocate the alpha mask
 160                         alpha = malloc( this->width * this->height );
 161
 162                         // Convert the image
 163                         mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
 164                                                                                   this->width, this->height,
 165                                                                                   gdk_pixbuf_get_rowstride( pixbuf ),
 166                                                                                   image, alpha );
 167                 }
 168                 else
 169                 {
 170                         // No alpha to extract
 171                         mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
 172                                                                                  this->width, this->height,
 173                                                                                  gdk_pixbuf_get_rowstride( pixbuf ),
 174                                                                                  image );
 175                 }
 176
 177                 // Finished with pixbuf now
 178                 g_object_unref( pixbuf );
 179
 180                 // Set width/height of frame
 181                 mlt_properties_set_int( properties, "width", this->width );
 182                 mlt_properties_set_int( properties, "height", this->height );
 183
 184                 // Pass alpha and image on properties with or without destructor
 185                 if ( this->counter >= 0 )
 186                 {
 187                         // if picture sequence pass the image and alpha data with destructor
 188                         mlt_properties_set_data( properties, "image", image, 0, free, NULL );
 189                         mlt_properties_set_data( properties, "alpha", alpha, 0, free, NULL );
 190                 }
 191                 else
 192                 {
 193                         // if single picture, reference the image and alpha in the producer
 194                         this->image = image;
 195                         this->alpha = alpha;
 196
 197                         // pass the image and alpha data without destructor
 198                         mlt_properties_set_data( properties, "image", image, 0, NULL, NULL );
 199                         mlt_properties_set_data( properties, "alpha", alpha, 0, NULL, NULL );
 200                 }
 201
 202                 // Set alpha call back
 203                 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 204
 205                 // Push the get_image method
 206                 mlt_frame_push_get_image( *frame, producer_get_image );
 207         }
 208
 209         // Update timecode on the frame we're creating
 210         mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
 211
 212         // Calculate the next timecode
 213         mlt_producer_prepare_next( producer );
 214
 215         return 0;
 216 }
 217
 218 static void producer_close( mlt_producer parent )
 219 {
 220         producer_pixbuf this = parent->child;
 221         if ( this->filename )
 222                 free( this->filename );
 223         if ( this->image )
 224                 free( this->image );
 225         if ( this->alpha )
 226                 free( this->alpha );
 227         parent->close = NULL;
 228         mlt_producer_close( parent );
 229         free( this );
 230 }
 231